Recent content by selseg

I have been trying to plate Copper on Copper sputtered Electronic grade Silicon Substrate which has been patterned and developed using UV photolithography. The patterns measure about 50-100microns in width and are about 1600microns long. I have tried plating 10micrometer thick Cu using a stock...

Hello, I have a silicon wafer with a 50nm layer of copper sputtered on it. I coated it with a 1µm of positive photo resist and patterned it with a UV laser stepper. Then I developed it and washed it thoroughly. The pattern has a surface area which measures appx 1300µm x 8µm. What I want to do...

1. In my polychemistry laboratory , the task was to determine the Number Average Molecular Weight and the Weight Average Molecular weight of two samples , one a polystyrene sample prepared by radical polymerization , and the other a polystyrene-block-isoprene polymer prepared by anionic...

I can , I thought it should look very professional.Sometimes I can't help thinking that way , thanks for drawing my attention to 'common sense' Its a chromatogram

Hi , I have an assignment which requires that I draw tangents from the point of inflection on a peak to the x-axis.I still cannot figure out how to do that using qtiplot or excel.

I have some pieces of rusted mild steel pipes that i intend to remove rust from.I inserted a test sample in 15% Hydrochloric acid for 4 hours after which all the rust was removed from the surface and corrosion has slowed dramatically after washing off the acid.The subsequent pieces of steel pipe...

Thank you very much Alkim ,I will do just that

Thank you very much Alkim ,It makes a lot of sense. But still on the first question , below are the results from the two samples .less than 0.3% of the composition is not accounted for from the analysis .Is that enough impurity to make such a huge difference ? Al --88.441 --89.443 Si...

I work at an Aluminum sheet casting plant, we use AlTiB as the grain refiner for our cast products.Ti:B ratio as indicated on certificates is 5:1 .We recently received a new consignment of AlTiB from another supplier in India.The certificates from our new supplier show that the The AlTiB we...

Which Electrolyte can I use to etch Aluminum without generating toxic gases , I currently use 1200ml Water, 1200ml (30%-33% HCl) , 1200ml(68% HNO3) , 80ml(50% HF)

Thank you very much , I checked from the link below earlier on . Why do they include the LM317 in that circuit ? in another circuit i found online , they used l7805. Why do they include these ics and capacitor ? http://www.instructables.com/id/Super-simple-high-power-LED-driver/?ALLSTEPS

What simple circuit that I can design for a 3V high power LED with max current 0.8 amps , I think the component names would help me , I would like to power it on 4.5 to 9 V batteries .Preferably lower voltages. Thanks

This is not a homework question anyway its just one of those questions that keeps occurring to me but it seems I forgot Newtons first law of motion . Thanks

Assuming a car is traveling at 100km/hr and there is a fly on the dashboard of the car, if the housefly attempts to fly , would it collide with the back glass of the car or it would move with the same velocity as the car thus being stationary. Assuming the same situation in a plane traveling...

Does anyone know any challenging Materials engineering related project I could undertake , I am in my final year and I would want a challenging final year project, preferably in industry.